Dembele - Christmas?

I see that they're now saying that Dembele may (pending a scan) be out until Christmas and that he may also need surgery to sort out the problem with his hip.

What I found odd was they reported this saying it was an injury that he had whilst at Fulham and was exacerbated when playing for Belgium - you would have thought that the pre-purchase medical would have picked up any anomalies like that. Maybe there was a panic to sign the man - although he wasn't a true last minute purchase - or that they thought it too insignificant to worry about.